Final answer:
A compound that can be converted into an active vitamin inside the body is known as a provitamin.
Step-by-step explanation:
A compound that can be converted into an active vitamin inside the body is known as a provitamin. Provitamins are substances that are transformed into active vitamins through metabolic processes. An example of a provitamin is β-carotene, which is converted into vitamin A in the animal body.